Diagnostic Aids

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following:

• Wiring Harness Circuits (B+, GND & VPWR To Fuel Pump Relay; FP, FPM, FP PWR, FP RTN & FPDM PWR). See Fig 1-Fig 5 .
• Faulty Inertia Fuel Shutoff (IFS) Switch
• Faulty Fuel Pump Driver Module (FPDM)
• Faulty Power Supply Relay Inside Constant Control Relay Module (CCRM)
• Faulty Powertrain Control Module (PCM)

Fig 1: Identifying Fuel Pump Driver Module Circuits & Connector Terminals (Continental)

Courtesy of FORD MOTOR CO.

Fig 2: Identifying Fuel Pump Driver Module Circuits & Connector Terminals (Cougar, Focus, Sable & Taurus)

Courtesy of FORD MOTOR CO.

Fig 3: Identifying Fuel Pump Driver Module Circuits & Connector Terminals (Escort)

Courtesy of FORD MOTOR CO.

Fig 4: Identifying Fuel Pump & Rear Electronics Module Circuits & Connector Terminals (LS & Thunderbird)

Courtesy of FORD MOTOR CO.

Fig 5: Identifying Fuel Pump Driver Module Circuits & Connector Terminals (Mustang)

Courtesy of FORD MOTOR CO.